Balanced valve.



f Patented me I9, |900.

,(Nu Model.)

UNITED STATES PATENT OFFICE.

HUGO LENTZ, OF BRNN, AUSTRIA-HUN GARY.

BALANCED VALVE.

SPECIFICATION fermig part of Letters Patent No. 652,029, dated June 19,1900. Application led .Iuh 19, 1899. Serial No. 721,'155. (No model.)

To all whom it Wty concern:

Be it known that I, HUGO LENTZ, a citizen of Germany, residing at Brnn,in the Province of Mhren, Austria-Hungary, have invented certain new anduseful Improvements in Balanced Double-Beat Valves; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to a novel construction in a balanced double-seatvalve, the object being to provide a valve of this description in whichthe upper and lower seats are of the same diameter; and it consists inthe features of construction and combinations of parts hereinafter fullydescribed and claimed.

In the accompanying drawings, illustrating my invention, Figure l is avertical longitudinal section of a valve and its seats constructed inaccordance with my invention. Fig. 2 is a similar section on the line 22 of Fig.` 3, showing the valve and one seat thereof, which are madefrom a single piece of metal, and indicating by dot-and-dash lines theform of the casting. Fig. 3 is a top plan view looking down on Fig. 2.

Double-seat valves as they are generally made are very badly balancedfor the reason that one end of the valve must be small enough to passthrough one of the seats, so that the seats are necessarily ofwidely-different diameters, thus causing unequal pressures on the endsof the valve, the greater pressure being on the larger end of the valve.Such badlybalanced valves when used in puppet-valve engines causeunequal strains, owing to the fact that the pressure holding the valvedown must be overcome by the gear, which produces great tensions in theseveral parts of 4e the saine and makes exact' regulation of the speedvery difficult. My present invention overcomes these difliculties.

Referring to the drawings, A indicates a vdouble-seat valve having itsupper seat a in a separate ring B, adapted to be mounted in avalve-casing O, and its lower seat Z7 likewise in said casing O. Saidring B is secured in said casing O preferably by means of screws, butmay be secured in any other suitable man- 5o ner. By forming the upperseat in a separate ring I3, I am enabled to make both valves of equaldiameter, th us perfectly balancing said valve. The said valve A isprovided with a central sleeve c for the reception of the valve- 5 5stem d, which may be secured therein in any suitable manner.

I claim as my invention;

l. A double-seat valve, comprising a valve having flaring ends ofpractically-equal diam- 6o eter, and a valve-seat of less diameter thansaid flaring ends encircling said valve between said ends, substantiallyas described.

2. A double-seat valve, comprising ahollow member having two fiaringends provided with ground faces of practically-equal diameter, and avalve-seat adapted to receive one of said ground faces encircling saidhollow member between its ends, substantially as described.

In testimony whereof I affix my signature 7o in presence of twowitnesses.

HUGO LENTZ.

